Scalable Ambient Obscurance

McGuire, Morgan; Mara, Michael; Luebke, David

Scalable Ambient Obscurance

Files

097-103.pdf (10.38 MB)

aaa_hpg12.mp4 (15.63 MB)

shaders.zip (9.8 KB)

Date

2012

Authors

McGuire, Morgan
Mara, Michael
Luebke, David

Publisher

The Eurographics Association

Abstract

This paper presents a set of architecture-aware performance and integration improvements for a recent screenspace ambient obscurance algorithm. These improvements collectively produce a 7x performance increase at 2560 x1600, generalize the algorithm to both forward and deferred renderers, and eliminate the radius- and scene-dependence of the previous algorithm to provide a hard real-time guarantee of fixed execution time. The optimizations build on three strategies: pre-filter the depth buffer to maximize memory hierarchy efficiency; reduce total bandwidth by carefully reconstructing positions and normals at high precision from a depth buffer; and exploit low-level intra- and inter-thread techniques for parallel, floating-point architectures.

        @inproceedings{:10.2312/EGGH/HPG12/097-103
,
booktitle = {Eurographics/ ACM SIGGRAPH Symposium on High Performance Graphics
},
editor = {Carsten Dachsbacher and Jacob Munkberg and Jacopo Pantaleoni
},
title = {{Scalable Ambient Obscurance
}},
author = {McGuire, Morgan and 
Mara, Michael and 
Luebke, David
},
year = {2012
},
publisher = {The Eurographics Association
},
ISSN = {2079-8679
},
ISBN = {978-3-905674-41-5
},
DOI = {/10.2312/EGGH/HPG12/097-103
}
}